Definition: Reptiles are animals with two arms, one that is not attached to limbs, and a "head" which has a "neck" for movement but lacks limbs or an organ system. They include snakes, lizards, scorpions, and most spiders. Their bodies are primarily hollow. Reptile definition includes creatures without fins or legs; they can have scales or scales over their skin; they typically live underground; they may be nocturnal or nocturnal-activity animals.
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